Long title | An Act to promote the Development of the Mining Resources of the United States. |
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Enacted by | the 42nd United States Congress |
Citations | |
Statutes at Large | Sess. 2, ch. 152, 17 Stat. 91–96 |
Legislative history | |
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Major amendments | |
Amendments |
The General Mining Act of 1872 is a United States federal law that authorizes and governs prospecting and mining for economic minerals, such as gold, platinum, and silver, on federal public lands. This law, approved on May 10, 1872, codified the informal system of acquiring and protecting mining claims on public land, formed by prospectors in California and Nevada from the late 1840s through the 1860s, such as during the California Gold Rush. All citizens of the United States of America 18 years or older have the right under the 1872 mining law to locate a lode (hard rock) or placer (gravel) mining claim on federal lands open to mineral entry. These claims may be located once a discovery of a locatable mineral is made. Locatable minerals include but are not limited to platinum, gold, silver, copper, lead, zinc, uranium and tungsten.
Miners and prospectors in the California Gold Rush of 1849 found themselves in a legal vacuum. Although the US federal government had laws governing the leasing of mineral land, the United States had only recently acquired California by the Treaty of Guadalupe Hidalgo, and had little presence in the newly acquired territories.
Miners organized their own governments in each new mining camp (for example the Great Republic of Rough and Ready), and adopted the Mexican mining laws then existing in California that gave the discoverer right to explore and mine gold and silver on public land. Miners moved from one camp to the next, and made the rules of all camps more or less the same, usually differing only in specifics such as in the maximum size of claims, and the frequency with which a claim had to be worked to avoid being forfeited and subject to being claimed by someone else. California miners spread the concept all over the west with each new mining rush, and the practices spread to all the states and territories west of the Great Plains.
Although the practices for open mining on public land were more-or-less universal in the West, and supported by state and territorial legislation, they were still illegal under existing federal law. At the end of the American Civil War, some eastern congressmen regarded western miners as squatters who were robbing the public patrimony, and proposed seizure of the western mines to pay the huge war debt. In June 1865, Representative George Washington Julian of Indiana introduced a bill for the government to take the western mines from their discoverers, and sell them at public auction. Representative Fernando Wood proposed that the government send an army to California, Colorado, and Arizona to expel the miners "by armed force if necessary to protect the rights of the Government in the mineral lands." He advocated that the federal government itself work the mines for the benefit of the treasury.